<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .w{
            width: 200px;
            height: 200px;
            margin: 20px auto 0;
            background: radial-gradient(red,yellow,blue);
        }
        .q{
            width: 200px;
            height: 200px;
            margin: 20px auto 0;
            background: radial-gradient(red 5%,yellow 60%,white 15%);
        }
        .v{
            width: 200px;
            height: 200px;
            margin: 20px auto 0;
            background: -webkit-radial-gradient(red 5%,yellow 60%,skyblue 15%)
        }
        .t{
            width: 200px;
            height: 400px;
            margin: 20px auto 0;
            /* background: radial-gradient(red 5%,yellow 60%,white 15%); */
            background: radial-gradient(circle,red,yellow,skyblue);
        }
    </style>
</head>
<body>
    <div class="w"></div>
    <div class="q"></div>
    <div class="v"></div>
    <div class="t"></div>
</body>
</html>